Consider a system running ten I/O-bound tasks and one CPU-bound task. Assume that the I/O-bound tasks issue an I/O operation once for every millisecond of CPU computing and that each I/O operation takes 10 milliseconds to complete. Also assume that the context switching overhead is 0.1 millisecond and that all processes are long-running tasks. What is the CPU utilization for a round-robin scheduler when:

Answer:

A jacket that originally costs $ 100 is on sale today for $ 80                                    

Explanation:

Main : From here the execution of the program begins

Set OldPrice = 100  -> This line assigns 100 to the OldPrice variable

Set SalePrice = 70   -> This line assigns 70to the SalePrice variable

Call BigSale(OldPrice, SalePrice)  -> This line calls BigSale method by passing OldPrice and SalePrice to that method

Write "A jacket that originally costs $ ", OldPrice  -> This line prints/displays the line: "A jacket that originally costs $ " with the resultant value in OldPrice variable that is 100

Write "is on sale today for $ ", SalePrice  -> This line prints/displays the line: "is on sale today for $ " with the resultant value in SalePrice variable that is 80

End Program -> the main program ends

Subprogram BigSale(Cost, Sale As Ref)  -> this is a definition of BigSale method which has two parameters i.e. Cost and Sale. Note that the Sale is declared as reference type

Set Sale = Cost * .80  -> This line multiplies the value of Cost with 0.80 and assigns the result to Sale variable

Set Cost = Cost + 20  -> This line adds 20 to the value of Cost  and assigns the result to Cost variable

End Subprogram  -> the method ends

This is the example of call by reference. So when the method BigSale is called in Main by reference by passing argument SalePrice to it, then this call copies the reference of SalePrice argument into formal parameter Sale. Inside BigSale method the reference &Sale is used to access actual argument i.e. SalePrice which is used in BigSale(OldPrice, SalePrice) call. So any changes made to value of Sale will affect the value of SalePrice

So when the method BigSale is called two arguments are passed to it OldPrice argument and SalePrice is passed by reference.

The value of OldPrice is 100 and SalePrice is 70

Now when method BigSale is called, the reference &Sale is used to access actual argument SalePrice = 70

In the body of this method there are two statements:

Sale = Cost * .80;

Cost = Cost + 20;

So when these statement execute:

Sale = 100 * 0.80 = 80

Cost = 100 + 20 = 120

Any changes made to value of Sale will affect the value of SalePrice as it is passed by reference. So when the Write "A jacket that originally costs $ " + OldPrice Write "is on sale today for $ " + SalePrice statement executes, the value of OldPrice remains 100 same as it does not affect this passed argument, but SalePrice was passed by reference so the changes made to &Sale by statement in method BigSale i.e.  Sale = Cost * .80; has changed the value of SalePrice from 70 to 80 because Sale = 100 * 0.80 = 80. So the output produced is:

A jacket that originally costs $ 100 is on sale today for $ 80                              

Answer:

cell_count = int(input("Enter the value: "))

cell_count *= 10

print(cell_count)

Explanation:

Ask the user to enter a value and set it to the cell_count variable

Multiply the cell_count by 10 and assign it to the cell_count (It can also be written as cell_count = cell_count * 10)

Print the cell_count

Answer:

//import the Random class

import java.util.Random;

//Begin class definition

public class CoinFlipper {

   //The main method

    public static void main(String []args){

       //Create an object of the Random class

       Random ran = new Random();

       System.out.println("Result");    

       //Use the object and the number of times for simulation

       //to call the flipCoin method

       flipCoin(ran, 25);

    } //End of main method

    //Method to flip coin

    public static void flipCoin(Random ran, int nooftimes){

        //Create a loop to run as many times as specified in variable nooftimes

       for(int i=1; i<=nooftimes; i++)

           System.out.println(ran.nextInt(2) + 1);

    }

}   //End of class definition

====================================================

Sample Output:

Result

1

1

1

2

1

2

2

1

2

1

1

2

1

2

1

1

1

2

1

1

1

2

2

1

2

========================================================

Explanation:

The above code has been written in Java. It contains comments explaining every part of the code. Please go through the comments.

The sample output from the execution of the code is also given above.

The code is re-written as follows without comments.

import java.util.Random;

public class CoinFlipper {

    public static void main(String []args){

       Random ran = new Random();

       System.out.println("Result");    

       flipCoin(ran, 25);

    }

    public static void flipCoin(Random ran, int nooftimes){

       for(int i=1; i<=nooftimes; i++)

           System.out.println(ran.nextInt(2) + 1);

    }

}

Answer:

x(t) = −2 cos ( [tex]\frac{\pi }{4}t[/tex]  − [tex]\frac{\pi }{2}[/tex] ) + 4 cos ( [tex]\frac{5\pi }{4}t[/tex] )

Explanation:

Given:

Fundamental period of real valued continuous-time periodic signal x(t) = T = 8

Non-zero Fourier series coefficients for x(t) :

a₁ = [tex]a^{*}_{-1}[/tex] = j

a₅ = [tex]a_{-5}[/tex] = 2  

To find:

Express x(t) in the form

               ∞

x(t) =        ∑    A[tex]_{k}[/tex] cos ( w[tex]_{k}[/tex] t + φ[tex]_{k}[/tex] )

              [tex]_{k=0}[/tex]  

Solution:

Compute fundamental frequency of the signal:

w₀ = 2 π / T

     = 2 π / 8               Since T = 8

w₀  = π / 4

                   ∞

                    ∑ [tex]a_{k}e^{jw_{0}t }[/tex]

x(t) =          k=⁻∞

     =  [tex]a_{1}e^{jw_{0} t} + a_{-1}e^{-jw_{0} t} + a_{5}e^{5jw_{0} t}+a_{-5}e^{-5jw_{0} t}[/tex]  

     =  [tex]je^{j(\pi/4)t} - je^{-j(\pi/4)t} +2e^{(5\pi/4)t}+2e^{-(5\pi/4) t}[/tex]

     = −2 sin ( [tex]\frac{\pi }{4}t[/tex] ) + 4 cos ( [tex]\frac{5\pi }{4}t[/tex] )

     = −2 cos ( [tex]\frac{\pi }{4}t[/tex]  − [tex]\frac{\pi }{2}[/tex] ) + 4 cos ( [tex]\frac{5\pi }{4}t[/tex] )

Answer:

The scores array: 70,20,35,15,40

Explanation:

I will explain the code line by line:

var scores = [70, 20, 35, 15];  

The above statement declares and assigns values to an array named scores

scores[scores.length] = 40;  

The above statement uses length to set the length of the scores array. It sets the last element of the scores array to 40. So this means 40 is set as the last element of scores.

scores.length returns the length of the scores array i.e. 4 as there are 4 elements in scores array 70,20,35,15

So the statement becomes:

scores[4] = 40;

This assigns value 40 to the 4th index of the scores array. Do not confuse 4th index with 4th element of the array because array element location starts from 0. So scores[4] does not mean 4th element but scores[4] means 4th index position of scores array. This makes 5th element of scores. So set the element 40 as 5th element at 4th index of scores.

alert("The scores array: " + scores);

This displays an alert box with the following message:

The scores array: 70,20,35,15,40

Answer:The new directory method creates a new directory within the current working directory.

Explanation:The new directory function and returns the list of the files within that directory.The new directory function allow to with the built in function MK dir().

To the new directory function create a current working directory.

import OS

OS.MKdir()

The code creates the directory projects in the current working directory to specify the full path.

Answer:

C. DAT-1

Explanation:

Chain of custody is applied when examining digital evidence and checking for proof that no alterations have been made to the document. It ensures that the original piece of digital evidence which could be in text, image, video, or other electronic formats, is preserved and protected from alterations. Hashing algorithms which are mathematical computations that help to condense files are applied during this procedure.

Common hashing algorithms applied, include;  the message digest 4, secure hashing algorithms 1, 2, 256, 224, 512, etc. The message digest 4 is used to evaluate why a particular piece of evidence was handled by an individual. This is further authenticated by examining the fingerprint.

Answer:just do it

Explanation:

How different quantities are determined

Answer:

Coding is a skill where you take instructions (the steps in a task) and translate it into a language the computer understands since computers do not communicate like humans. They communicate in a language called BINARY and it is uses 0's and 1's. Coders write the instructions using a programming language.

Explanation:

Coding is a skill where you take instructions (the steps in a task) and translate it into a language the computer understands since computers do not communicate like humans. They communicate in a language called BINARY and it is uses 0's and 1's. Coders write the instructions using a programming language.

Answer:

c. suffer from indefinite postponement.

Explanation:

Algorithm is a set of rules that are followed in calculations or other problem solving operation by a computer. An algorithm may execute for unknown amount of time and it may suffer indefinite postponement. Algorithm depends on random numbers and it can execute continuously.

Answer:

when there is no junk

Explanation:

If you choose the checkbox next to “Delete the driver software from this device,” your computer will no longer contain the driver or any associated registry keys. Either method will prevent you from using the device until you reinstall the device driver.

To connect and communicate with particular devices, a computer needs device drivers.

It may be taken out without any trouble. However, it also comes with the installers for your PC's drivers. You will need to go to the manufacturer's website to download them again if you accidentally delete them.

Therefore, No, unless your new driver is broken and corrupts data. Install the driver if it comes from a reliable source. It is not intended to. Having a backup system that keeps your data safe in case of issues is a good idea.

Learn more about driver files here:

https://brainly.com/question/10608750

#SPJ5

Answer:The purpose of the lo jack on a computer  to the lock and delete files on the computer devices.

Explanation:The lo jack on a computer to locate all the lock and delete files.

lo jack can provides the computer on the passwords that contains different levels of the bios access.

lo jack perform on the computer operating system provides on the boot only the trusted by the computer operating system.

Lo jack computer on the function is used to the published  the exam answers on the websites.

Lo jack insures to the data into hard drives to the correct computer password.

Answer:

public static boolean isPalindrome(String word) {

   //TODO: Complete this method

   String reverse = "";  

       for (int i = (word.length()-1); i>=0; i--) {

           if(word.charAt(i)!=' '){

               reverse+=word.charAt(i);

           }

       }

   String without_space = word.replaceAll(" ", "");

   return reverse.equals(without_space);

   }

Methods are collections of named code blocks, that are executed when called or evoked.

The isPalindrome method written in Java, where comments are used to explain each line is as follows

//This defines the method

public static boolean isPalindrome(String word) {

   //This removes all the spaces in the word

   String newStr = word.replaceAll(" ", "");

   //This initializes an empty string

   String rev = "";  

   //This iterates through the word, in reverse order

   for (int i = (word.length()-1); i>=0; i--) {

       //This gets all the characters in the string (without the space)

       if(word.charAt(i)!=' '){

           rev+=word.charAt(i);

       }

   }

   //This returns true or false

   return reverse.equals(newStr);

}

Read more about methods at:

https://brainly.com/question/19360941

Answer:

a. 118.20.210.254

Explanation:

Here are the few characteristics of Class A:

First bit of the first octet of class A is 0.

This class has 8 bits for network and 24 bits for hosts.

The default sub-net mask for class A IP address is 255.0.0.0

Lets see if the first bit of first octet of 118.20.210.254 address is 0.

118 in binary (8 bits) can be represented as : 1110110

To complete 8 bits add a 0 to the left.

01110110

First bit of the first octet of class A is 0 So this is class A address.

For option b the first octet is : 183 in the form of bits = 10110111 So it is not class A address

For option c the first octet is 215 in the form of bits = 11010111 So it is not class A address

For option d the first octet is 255 in the form of bits = 11111111. The first bit of first octet is not 0 so it is also not class A address.

Answer:

b. myString[:-5]

d. myString[-15:-5]

Explanation:

I believe you have a typo in d. It must be d. myString[-15:-5]

Slicing can be done:

myString[starting_index, stopping_index, step] (step is optional). If you do not specify the starting index, it will start from the 0 as in b. If you write a range that is not in the range, as in d, Python will replace it with either 0 or length of the string (In this case, it is replaced with 0 because the starting index must be smaller than stopping index)

a. myString[5] → This will give you the sixth character

b. myString[:-5] → This will give you the first five characters

c. myString[0:6] → This will give you the first six characters

d. myString-15:-5] → This will give you the first five characters

e. myString[0:10:2] → This will give you the first, third, fifth, seventh, and ninth characters

Answer:

B

Explanation:

When organizing your career portfolio, you should highlight the skills and experiences most relevant to those thinking of hiring you. Thus, option B is correct.

A combination resume  can be described as the resume format  which was designed for highly-trained job seekers with previous work experience.

In a case whereby a chronological resume lists your work history in reverse order, starting with your current or most recent job and working backwards and many employers like this format because it presents your work history in a clear, easy-to-follow arrangement the type of resume will you choose to use is Combination resume.

It should be noted that it is been reffered to as combination”  as a result of how it combines the most notable features of both the functional resume format and the chronological resume.

Therefore, When organizing your career portfolio, you should highlight the skills and experiences most relevant to those thinking of hiring you. Thus, option B is correct.

Learn more about resume at:

brainly.com/question/14218463

#SPJ7

Answer:

Here is the C++ program:

#include <iostream>  //for using input output functions

using namespace std;  //to identify objects like cin cout

class Plane{  //class Plane

private:  // declare private data members i.e. first_class and eco_class

int first_class;  //variable for first class

int eco_class;  //variable declared for economy class

public:  // public access modifier

Plane(){  //constructor to initialize values of first_class and eco_class

first_class=0;  //initialized to 0

eco_class=0;}   //initialized to 0

int getFirst(){  // class method to get data member first_class

return first_class;}   //returns the no of reserved first class seats

int getEco(){  // class method to get data member eco_class

return eco_class;}  //returns the no of reserved eco class seats

void CheckIn(){  //method to handle the check in process

int choice;  //choice between first and economy class

cout<<"\nEnter 1 to select First Class Seat: "<<endl;  //prompts user to enter 1 to reserve first class seat

cout<<"\nEnter 2 to select Economy Class Seat: "<<endl;   //prompts user to enter 2 to reserve economy class seat

cin>>choice;   //reads the choice from user

switch(choice){  // switch statement is used to handle the check in process

case 1:  //to handle the first class seat reservation

if(getFirst()<5){  //if the seat is available and the seat limit has not exceed 5

first_class++;  //add 1 to the first_class seat to count that a seat is reserved

cout<<"You reserved First class seat! ";} //display the message about successful seat reservation in first class

cout<<"\nNumber of first class seats reserved: "<<getFirst()<<endl;}  //displays the number of seats already reserved

else{  //if all first class seats are reserved then display the following message

cout<<"No more seats available for you selection!"<<endl;  

if(getEco()>=5 && getFirst()>=5){  //if all seats from first class and economy class are reserved display the following message

cout<<"All seats are reserved!"<<endl;  

exit(1);}}  //program exits

break;  

case 2:  //to handle the economy seat reservation

if(getEco()<5){   //if the seat is available and the seat limit has not exceed 5

eco_class++;  //add 1 to the eco_class seat to count that a seat is reserved

cout<<"You reserved Economy class seat! "; //display the message about successful seat reservation in economy class

cout<<"\nNumber of Economy class seats reserved: "<<getEco()<<endl;}  //displays the number of seats already reserved

else{  //if all economy class seats are reserved then display the following message

cout<<"No more seats available for you selection!"<<endl;

if(getEco()>=5 && getFirst()>=5){  //if all seats from first class and economy class are reserved display the following message

cout<<"All seats are reserved!"<<endl;

exit(1);}}  //program exits

break;

default: cout<<"Enter a valid choice"<<endl; } } };   //if user enters anything other that 1 or 2 for choice then this message is displayed

int main(){  //start of main() function body

int select;  // choice from first or economy class

Plane plane;  //create an object of Plane class

cout<<"**************************"<<endl;

cout<<"Airline Reservation System"<<endl;  //display this welcome message

cout<<"**************************"<<endl;

while(true){  // while loop executes the check in procedure

plane.CheckIn();} }  //class CheckIn method of Plane classs using plane object to start with the check in process

Explanation:

The program is elaborated in the comments with each statement of the above code. The program has a class Plane that has a method CheckIn to handle the check in process. The user is prompted to enter a choice i.e. enter 1 to select First Class Seat and enter 2 to select Economy Seat. A switch statement is used to handle this process. If user enters 1 then the case 1 of switch statement executes which reserves a seat for the user in first class. If user enters 2 then the case 2 of switch statement executes which reserves a seat for the user in economy class.There are only 5 seats for each First Class and Economy. So when the limit of the seats reservation exceeds 5 then the no more seats available for you selection is displayed. If all the seats are taken in both the first and economy class then it displays the message All seats are reserved. If the user enters anything other than 1 or 2 then display the message Enter a valid choice. Whenever the user reserves one of first or economy class seats the relevant seat is incremented to 1 in order to count the number of seats being reserved. The program and its output are attached.

Answer:

the HTML tag for the paragraph is <p>.

Explanation:

To insert the paragraph in the website, use the <p> tag to start the paragraph and to end the paragraph, use the closing paragraph tag that is </p>.

The paragraph tag is used inside the body tag. for example,

<html>

 <head></head>

 <body>

   <p>this is a paragraph

   </p>

 </body>

</html>

Complete Question:

Jason has a part time job in the office of a construction company and is also a student at a community college. He often works on his homework during times when he is not busy at work because the office computer contains the software he needs to do his assignments and he hasn't been able to afford to purchase the software for his own personal computer. Which of these unacceptable uses typically included in a user access policy might he most likely be engaging in?

1.Using the network to download software for personal use

2.Disclosing personal information about employees

3.Copying of copyrighted material

4.Using a network account for a purpose not specified by the owner’s job description

Answer:

4.Using a network account for a purpose not specified by the owner’s job description

Explanation:

The office computer is meant to be used for the owner's purpose only.  By using the office computer to do his homework, even at a free hour, Jason is still violating his employer's asset for selfish purpose.  Jason could obtain permission from his manager to use the office computer for his homework for a temporary period, until he could "afford to purchase the software for his own personal computer."  The official permission can exempt him from being penalized for the violation.  A written permission is more ideal in this case.

Answer:

Mon Feb 26 2017

Explanation:

Since the current date is considered as Monday, February 26, 2017, thisDay will be set to that value.

The toDateString() method returns the first three letters of the name of the day (The first letter is capitalized), the first three letters of the name of the month (The first letter is capitalized), the day of the month as an integer, and the year as an integer (There are spaces between all)

Answer:

Last name: Duck

Explanation:

explanation is provided in the attached document.

Answer:

/etc/yum.conf

Explanation:

The absolute pathname for YUM is /etc/yum.conf. The configuration file For yum and related utilities can be found there. The file has one compulsory section, and this section can be used to place Yum options with global effect, it could also have one or more sections, that can enable you to set repository-specific options.

Answer:

A function is defined before it is first invoked.

Explanation:

A function prototype is a term in computer programming that is used as the declaration of a function that specifies function's name, parameters and return type. However, unlike function itself, which specifies what it does, a function prototype specifies function's interface only and not what it does.

Hence, A function prototype can always be omitted when: a function is defined before it is first invoked.

Answer:

I am writing a Python program. Here is the function twoWordsV2:

def twoWordsV2 (length,firstLetter):#definition of function which takes length of the first word and first letter of the second word as parameter and returns these two words in a list

   word1 = "" # stores the first word

   word2= "" #holds the second word  

   while(len(word1)!=length): # checks if the input word1 length is not equal to the specified length

       word1 = input('A ' + str(length) + '-letter word please: ') #asks user to enter the input word1 of specified length

   while(word2!=firstLetter): #checks if the first character of input word2 is not equal to the specified firstLetter character

       word2 = input('A word beginning with ' + firstLetter+ ' please: ')#asks user to enter the input word2 begining with specified first letter

       if word2[0] == firstLetter.upper() or word2[0] == firstLetter.lower():#second word may begin with either an upper or lower case instance of firstLetter      

           return [word1,word2] #return the two words in a list                

#to check the working of the function use the following statement        

print(twoWordsV2(4,'B')) #calls twoWordsV2  method by passing 4 (length) and B (first letter)

Explanation:  

twoWordsV2 method has two parameters i.e length which is the length of the first word and firstLetter which is the first character of the the second word. This means the first word should be of specified length, and the second word should begin with a specified first letter. The function returns the two resultant words with the above specifications. These two words are displayed in a list. I will explain the working of the function with the help of an example:

Suppose length = 4 and firstLetter = 'B' and user enters "ok" as word1. input() method takes first word input from user.

The first while loop checks if the length of word1 i.e. ok is not equal to specified length i.e. 4. Length of word1 is checked using len function which returns 2 so length of word1 is 2. The loop condition is true because length of word1 i.e. 2 is not equal to specified length i.e. 4. So the body of the loop executes which displays this message:

A 4-letter word please:

Here notice that str(length) is changed to 4. This is because length=4 and str() converts this value into string.

So the above message keeps displaying until user enters a four letter word. Lets suppose user now enters "four". Now the while loop condition evaluates to false and the loop breaks. The program control  moves to the next line which is a while loop.

The second while loop checks if the first character of input word2 is not equal to the specified firstLetter character. Suppose word2 = "apple" and firstLetter= 'B'

Now the loop condition evaluates to true because word2 is not equal to first letter B. Now the main part of this while loop is the if condition: if word2[0] == firstLetter.upper() or word2[0] == firstLetter.lower() This statement checks if the first index of the word2 is equal to firstLetter. The word2 can contain a capital B or a small B so if condition checks both the cases by using upper and lower methods that converts the firstLetter to upper or lower and then match with the first letter of word2 i.e. the letter at index 0 of the word2. If this condition evaluates to true then next return statement returns the word1 and word2 in a list otherwise the second while loop keep asking user to enter the word2 with starting letter to be firstLetter i.e. 'B'.

The screenshot of the program and its output is attached.

The function for the given problem is:

These 10 lines of code were written using the Python programming language and this was used to define, store and hold the function and then request input from the user, check if the given input was according to the required parameters, and then print the output.

Read more about python programming language here:
https://brainly.com/question/7015522

Answer:

It is a C++ program. The complete function   ConvertToDecadesAndYears which takes totalYears as parameter and convert totalYears to decades and years is provided in the attached document.

Explanation:

The explanation is provided in the attached document.

The screenshot of the complete code along with its output is attached.

Answer:

Bandwidth delay product = 2500 Kbits

Utilization = 0.02%

Explanation:

We proceed as follows;

From the question, we are given that

band width = 500 Mbps

The bandwidth-delay product is = 500 x 10^6 x 25 x 10^-3

= 2500 Kbits

The system can send 12500 Kbits during the time it takes for the data to go from the sender to the receiver and then back again.

However, the system sends only 2500 bits.

The the link utilization =

2500/(12500 x 10^3) = 0.02%

Answer:

2500 kb

Explanation:

Here, we are to calculate the bandwidth delay product

From the question, we are given that

band width = 500 Mbps

The bandwidth-delay product is = 500 x 10^6 x 25 x 10^-3

= 2500 Kbits

Answer:

The correct answer will be "Virtual networks".

Explanation:

Answer:

The correct form of the program in python is as follows

def even_numbers(maximum):

     return_string = ""  

     for x in range(1,maximum+1):

           if x % 2 == 0:

                 return_string+=str(x)+" "

     return return_string.strip()

Explanation:

This line defines the method

def even_numbers(maximum):

This line initializes return_string to an empty string

     return_string = ""  

This line iterates through variable maximum

     for x in range(1,maximum+1):

This line checks if the current number is even

           if x % 2 == 0:

If yes, the string is updated

                 return_string+=str(x)+" "

This line returns the full string of even numbers

    return return_string.strip()

When the method is tested with any of the following, it gives the desired result

print(even_numbers(6)), print(even_numbers(10)), print(even_numbers(1)), print(even_numbers(3)) and print(even_numbers(0))

Answer:

Spear Phishing and War Dialing

Explanation:

So let's tackle these one at a time.

Vishing is simply any type of message (i.e., email, text, phone call, etc.) that appears to be from a trusted source but is not.

Whaling is simply a spear phishing attack of a high-value target such as a CEO or someone with high-level access at a company.

Spear phishing is simply a targeted phishing attack, usually towards a specific person or group of people.  (Phishing attack is simply a social attack to try and gain unauthorized access to a resource).

Pharming is an attack that attempts to redirect website traffic to a fake site.

War dialing is a technique to automatically scan a list of numbers in an area in attempt to search for exposed modems, computers, board systems, or fax machines, in order to breach the network.

Hoaxing is simply a social attack that describes a serious threat in attempts to retrieve unauthorized access or money from a victim.  (Think microsoft tech support scams)

Now that we have defined these things, let's identify the possible threats that need to be reported.

(a) Vishing?  The sec admin report doesn't mention the source of the message so we cannot associate this one

(b) Whaling? The sec admin report says a user, implying someone not high up in the company, but doesn't say it's not someone high up.  This is possible.

(c) Spear phishing?  The sec admin report says a user, implying that only this user is being targeted so this is definitely valid.

(d) Pharming?  The sec admin report says nothing about site redirection.

(e) War dialing? The sec admin report doesn't say anything about unauthorized scanning; however, it mentions the user has an old functioning modem, so this is possible.

(f) Hoaxing?  The sec admin report doesn't mention a pop up in the email or the content of the email so we are uncertain.

Thus with these considerations, the two threats that are identified and need mitigation are Spear phishing and War Dialing/Whaling.  Note that we aren't positive of the war dialing or whaling, but a case could be made for either; however, given the modem information, the question seems to indicate war dialing.